Rider brush for plan sifters



April 14, 1931. H. sTAMM RIDER BRUSH FOR PLAN SIFTERS lFiled March 26, 1950 will W s,

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Patented Apr.V 14, 1931 UNTED STATES PATENT OFFICE RIDER BRUSH FOR PLAN SIFTERS Application filed March 26, 1930, Serial No. 439,242, and in Germany December 9, 1929.

The brushes commonly used in plan sifters present the inconvenience, that the metal bars guiding the same and the guiding elements of Vthe brush sliding on these metal 'i5 bars consist of stationary or rotating metallic silk gauze cover, get stuck on the reversing curves of the guide bars and become 1nopera-y tive. Expensive replacing of the brushes and of the metal bars on the sieve and expensive v repairing of the silk gauze cover of the plan sitters are therefore frequently necessary.

This invention relates to a rider-brush for plan sitters in which these inconveniences do not exist and which, even when the guide elements have worn entirely, can be repaired 2 with little expense. This is obtained according to the invention in that the brush is guided on the metal bars of the plan sitters by means of two small brushes'iixed perpendicularly the one opposite the other on the brush, and the bundles of bristles of which bear from both sides against the guide bars and partly in downward direction against the metallic bottom plate of the plan sitter, the bristles viewed in the direction of the brush carriage being rearwardly declined, similarly as the bristles with which the brushes usually rest upon the bottom of the plan sitter.

Two embodiments of the invention are illustrated by way oi example in the accompanying drawing in which Fig. l shows diagrammatically a plan sitter with guide bars for the brushes and the brushes sliding along the same in top plan view.

Fig. 2 shows the improved brush in cross section perpendicular to its direction of travel on line II-II of Fig. 3.

Fig. 3 shows the brush seen from below.

Fig. 4 is a longitudinal section, parallel to the direction of travel of the brush on line IV-IV of Fig. 3.

Fig. 5 shows seen from below a. brush of a second form of construction.

On the sheet metal bottom plate 1 of the plan sitter guide bars 3 of metal are fixed as usual by soldering, on which the brushes 4 resting upon the sheet metal bottom plate and the brushes 5 touching the cover 2 of silk gauze having thin hair bristles, move, when the plan sitter is oscillated to and fro at high speed. The brushes or bristle bundles 4 and hair bundles 5 are rearwardly inclined in the same direction so that they allow of the brushes travelling only in one direction as the brushes are prevented from following the return movements of the sieve, the bristles acting as locking means.

Parallel to the guide bars 3 brush bodies 6 with bristles 9 forming vertical brush faces are fixed on the main brush 8 under the plate 7 connecting the two parts of the brush, the bristle bundles 9 of said main brush 8 being rearwardly inclined like the bristle bundles Ll. are further slightly inclined downwards so that they extend to below the brush bodies 6. The bundles of bristles 9 bear with slight pressure against the guide bars 8 and guide the brush on this bar always securely, until they are worn so that a secure guiding is no longer possible. To replace the brush bodies 6 is not expensive and very simple. The guide bars 3 are saved by the bristles, so that they are not worn very much. Edging of the brushes in the veering curve does no longer happen, and also the silk gauze cover is no longer thrown upward.

In Fig. 5 a form of construction is shown according to 4which the rider-brush has a brush body made in one piece. The small guiding brushes 6 with the bristles 9 are fixed on the brush body of the rider-brush not on the sides but from below.

I claim l. A rider-brush for plan sitters, compris ing in combination with the bottom plate o the plan sifter, a guide bar, two brush bodies rigidly connected across said guide bar, bundles of bristles having brush faces directed towards said guide bar from two sides the bristles of said bundles being inclined in a direction opposite to the direction of movement of the brush.

2. A rider-brush as specilied in claim 1,

The lowermost bristle bundles comprising in combination With the two brush bodies, bundles of bristles on said brush bodies With vertical brushing faces directed from both sides towards the guide bar and having the bristles inclined in a direction opposite to the direction of movement of said brush. 'Y

3. A rider-brush as specified in claim l, comprising in combination With the tWO lo brush bodies, bundles of bristles on said brush bodies with vertical brushing faces directed from both sides towards the guide bar and having the bristles inclined in a direction opposite to the direction of movement of said brush,ltlie lowermost of said bundles of bristles being at the, same time downwardly inclined.

Intesbmny whereof I. aX my Signature.

HEINRICH STAMM. 

